Recent developments concerning the population biology and managment of Phytophthora infestans in the USA

Audio and summary of the lecture that William Fry, Section of Plant Pathology and Plant- Microbe Biology. School of Integrative Plant Science, Cornell University, USA, presented at the XXVI Biennial Congress of the Latin American Potato Association (ALAP) in Bogota (Colombia).

Update: How to Control Potato Late Blight by Using Fungicides Correctly | Using a new tool, small-scale farmers can now know what kind of fungicide to use and when and how often to apply it. More at https://bit.ly/2ErG4UQ

Phytophthora infestans, the causal agent of potato and tomato late blight is largely asexual in the USA, with a few clonal lineages that have been dominant in the country.  In 2009, US22 became widely prevalent because it was distributed through out the eastern half of the country by a national supplier of tomato transplants.  It has been displaced by the US23 clonal lineage.  The US24 clonal lineage has had a more regional distribution.  The characteristics of these three clonal lineages will be described and compared to previously dominant clonal lineages: US8 and US11.  Additionally, there is some evidence for a recombination event occurring (likely in the USA), but the progeny seem unlikely to have survived.  The importance of knowing the specific lineage causing disease in an area will be illustrated via a Decision Support System developed at Cornell University.

Fry, William. Section of Plant Pathology and Plant- Microbe Biology. School of Integrative Plant Science. Cornell University. Ithaca, NY USA. E-mail: wef1@cornell.edu

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